282 
The American Geologist. 
May, 1891 
MISCELLANEOUS. 
NEAREST RELATIVES. 
1. ] 
Principal septum is placed in the fovea. Columella 
is vesicular or tubular. 
1. Lophophyllum. 
2. Haplophyllia. 
2. 
Septa protrude at the base as a small cone. 
Petraia. 
3. 
5epta of first order spread out at their inner edges to 
form secondary wall. 
Aulophyllum. 
4. 
Petraia. 
5. 
6. 
Columella is formed of two smooth conical processes, 
thick at the base and tending to fill up the inter- 
septal cavities. 
Cyathaxonia. 
7. 
Compartmented only in short basal portion. 
1. Turbinolopsis. 
2. Cenophyllum. 
8. 
The four principal septa are stronger and form a cross. 
Phryganophyllum. 
9. 
Lindstrom considers the species of Lonsdale and Phil- 
lips as Cyathophylla. 
Petraia. 
10. 
Acanthodes. 
11. 
Fovea with three principal septa form a cross. 
Hadrophyllum. 
12. 
Principal septum is in fovea, to which the neighbor- 
ing septa are rather pinnate. 
1. Mycrocyclus. 
2. Palseocyclus. 
13. 
The four fovea? form a cross, but are not always dis- 
tinct. 
Baryphyllum. 
14. 
Principal septum placed in the fovea. 
Combophyllum. 
15. 
Duncan has found tabula? and vesicles in P. rugosus, 
E. and H., and includes genus under Cyathophyllum. 
Combophyllum. 
16. 
The spines are short and represent septa in lowest 
stage of development. 
Acanthocyclus. 
17 
An appearance of simple dissepiments maybe pro- 
duced near wall by branching of tabulre. 
1. Zaphrentis. 
2. Calophyllum. 
18 
Principal septum dwarfed and in fovea. The three 
others strongly developed, thus forming a cross. 
Polyccelia. 
19 
Quite generally regarded as synonymous with Am 
plexus. 
Amplexus. 
20 
Septa are formed of regularly superposed membrani 
form layers, non-continuous, with supporting 
growths. 
Cyathophyllum, (sim 
pie forms of helian 
thoides). 
21 
Broad, shallow vesicles may be formed by incom 
plete continuity of tabulae. 
Amplexus. 
22 
Has not been considered as a rugose coral, but its 
characters bring it into this group. 
Cyathophylloides,(com 
pound forms). 
23 
This genus is placed intermediate between Amplexus 
and Zaphrentis in regard to its septal development 
1. Amplexus. 
2. Zaphrentis. 
L>4 
Composed <>f superposed laminae impressed with the 
I cell pits. 
Strombodes. 
